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Net Loss Per Share - Computation of Net Loss Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share [Abstract]    
Net loss $ (25,562)us-gaap_NetIncomeLoss $ (27,641)us-gaap_NetIncomeLoss
Weighted average shares - basic and diluted (shares) 64,880,677us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 63,447,309us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Net loss per share - basic and diluted ($ per share) $ (0.39)us-gaap_EarningsPerShareBasicAndDiluted $ (0.44)us-gaap_EarningsPerShareBasicAndDiluted